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Front conductive paste for crystalline silicon solar cell, preparation method thereof, and solar cell

A technology for solar cells and conductive pastes, applied in the field of solar cells, can solve the problems of increased surface resistance of front electrodes and silicon wafers, inability to etch the anti-reflection insulating layer, and reduced photoelectric conversion efficiency of cells, and achieve excellent etching results. The effect of corrosion resistance and adhesion, strong adhesion and low contact resistance

Active Publication Date: 2021-04-27
SOLTRIUM ADVANCED MATERIALS TECH LTD SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a front conductive paste for crystalline silicon solar cells and a preparation method thereof, so as to solve the problem that the existing front conductive paste cannot effectively etch the anti-reflection insulating layer on the surface of the cell. , which leads to an increase in the resistance value of the contact between the front electrode and the silicon wafer surface, and ultimately reduces the photoelectric conversion efficiency of the cell.

Method used

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  • Front conductive paste for crystalline silicon solar cell, preparation method thereof, and solar cell
  • Front conductive paste for crystalline silicon solar cell, preparation method thereof, and solar cell
  • Front conductive paste for crystalline silicon solar cell, preparation method thereof, and solar cell

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preparation example Construction

[0055] like figure 1 As shown, the preparation method of the front conductive paste of the crystalline silicon solar cell of the present invention comprises the following steps:

[0056] S01. The preparation steps of the oxide etchant are as follows: Weigh the oxide etchant raw material according to the ratio of raw materials mentioned above and mix them uniformly; put the uniformly mixed oxide etchant raw material into a heating furnace for heating to 900-1100°C, and keep warm at 900-1100°C for 60-180min to obtain a molten liquid oxide etchant; quench the molten liquid oxide etchant to obtain oxide etchant particles ; drying the oxide etchant particles at a temperature of 60-80° C.; crushing the dried oxide etchant particles to obtain oxide etchant powder with a particle size of 0.5-5.0 μm, Then place it in a drying oven and dry it at 80-100° C. to obtain dry oxide etchant powder.

[0057] Preferably, the quenching method is pouring the molten liquid oxide etchant into wate...

Embodiment 1

[0076] A front conductive paste for a crystalline silicon solar cell, calculated based on a total weight of 100 parts, comprises components in the following proportions: 88.5 parts of silver powder; 9.0 parts of an organic vehicle; and 2.5 parts of an oxide etchant.

[0077] Wherein, based on the weight of the oxide etchant as 100%, the following components are included:

[0078] Pb 3 o 4 6%, TeO 2 55%, Li 2 O 5%, SiO 2 20%, B 2 o 3 2.9%, Bi 2 o 3 2%, ZnO 3%, WO 3 1%, CuO 0.1%, P 2 o 5 5%.

[0079]The preparation method of the oxide etchant is as follows: Weigh the oxide etchant raw materials according to the above ratio and mix them uniformly; put the uniformly mixed oxide etchant raw materials into a heating furnace and heat to 1000°C, and keep warm at 1000°C for 120 minutes to obtain a molten liquid oxide etchant; pour the molten liquid oxide etchant into water at normal temperature (25°C) to cool to obtain oxide etchant particles; Place the oxide etchant...

Embodiment 2

[0087] A front conductive paste for a crystalline silicon solar cell, calculated based on a total weight of 100 parts, comprises components in the following proportions: 88.5 parts of silver powder; 9.0 parts of an organic vehicle; and 2.5 parts of an oxide etchant.

[0088] Wherein, based on the weight of the oxide etchant as 100%, the following components are included:

[0089] Pb 3 o 4 24%, TeO 2 20%, Li 2 O 11%, SiO 2 2%, B 2 o 3 9.9%, Bi 2 o 3 5%, ZnO 13%, WO 3 5%, CuO 10%, P 2 o 5 0.1%.

[0090] The preparation method of the oxide etchant is as follows: Weigh the oxide etchant raw materials according to the above ratio and mix them uniformly; put the uniformly mixed oxide etchant raw materials into a heating furnace and heat to 1000°C, and keep warm at 1000°C for 120 minutes to obtain a molten liquid oxide etchant; pour the molten liquid oxide etchant into water at normal temperature (25°C) to cool to obtain oxide etchant particles; Place the oxide et...

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Abstract

The present invention provides a front conductive paste for crystalline silicon solar cells. In parts by weight, the front conductive paste for crystalline silicon solar cells includes the following raw material components: 80.0-93.0 parts of metal powder; 6.0-15.0 parts of organic carrier; 1.0-5.0 parts of material etchant; wherein, the oxide etchant contains at least Pb 3 o 4 , CuO and Li 2 O, and the CuO and Pb 3 o 4 The weight ratio of CuO and Li is 0.02 to 2.5, and the CuO and Li 2 The weight ratio of O is 0.025-3. During the sintering process, the front conductive paste can make metal powder and silicon form good ohmic contact, greatly reduce resistance, and finally obtain a front electrode with low contact resistance, good conductivity and strong adhesion.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a front conductive paste of a crystalline silicon solar cell, a preparation method thereof, and a solar cell. Background technique [0002] Solar energy is an inexhaustible clean energy source. With the depletion of non-renewable energy such as coal and oil, the development and utilization of solar energy has become a hot spot. The solar cell developed based on this idea is an important means of utilizing solar energy. At present, industrialized crystalline silicon solar cells have become a model for solar cell applications. [0003] The battery sheet is the core component of the crystalline silicon solar cell. In order to collect and export the current generated under the light, it is necessary to make an electrode on the front and back of the battery sheet. There are various methods for manufacturing electrodes, among which screen printing and co-firing are t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22
CPCH01B1/22
Inventor 张杰刘小丽孙丰振李宇黄玉平李德林
Owner SOLTRIUM ADVANCED MATERIALS TECH LTD SHENZHEN
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